Testing Mathematica if you don't have it installed

Note: this only works if the answer provides a CDF file or Mathematica Notebook file.

If the answer provides a CDF file or Mathematica Notebook file, you can use the Wolfram CDF Player to view those files.

1. Go to the CDF Player download page
2. Fill in the little form.
3. Download the installer and install the CDF player.

To save a Mathematica file as a CDF file or Mathematica Notebook

If you have a Mathematica answer and want to provide a CDF file or Mathematica Notebook file:

1. Go to File -> Save As (or press Shift+Ctrl+S)
2. Select "Mathematica Notebook" or "Computable Document".
3. Save the file.